There's actually a new feature for this! https://www.windowscentral.com/how-use-windows-sandbox-windo...

However, I use Virtualbox and/or VMware Player a lot, and Hyper-V doesn't play well with others, so I can't use any features of Windows that depend on Hyper-V virtualization.

I personally use a UWP app that embeds Discord's web interface. It's surprisingly serviceable.

Sandboxie is a free option that usually works:

https://www.sandboxie.com/

Well, Discord specifically works in a regular web browser too, which will sandbox it from the rest of your system. There's a couple minor features that will be missing, like the ability to show your friends what game you're playing, but those features tend to be the ones any other sandboxing solution will block too.

Browser. Virtual Machine. Literally called Windows Sandbox. https://www.windowscentral.com/how-use-windows-sandbox-windo...